Journal Article

A new method of measuring the cluster peculiar velocity power spectrum

Pengjie Zhang, Hume A. Feldman, Roman Juszkiewicz and Albert Stebbins

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 388, issue 2, pages 884-888
Published in print August 2008 | ISSN: 0035-8711
Published online July 2008 | e-ISSN: 1365-2966 | DOI:
A new method of measuring the cluster peculiar velocity power spectrum

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We propose to use spatial correlations of the kinetic Sunyaev–Zeldovich (KSZ) flux as an estimator of the peculiar velocity power spectrum. In contrast with conventional techniques, our new method does not require measurements of the thermal SZ signal or the X-ray temperature. Moreover, this method has the special advantage that the expected systematic errors are always subdominant to statistical errors on all scales and redshifts of interest. We show that future large sky coverage KSZ surveys may allow a peculiar velocity power spectrum estimates of an accuracy reaching ∼10 per cent.

Keywords: cosmic microwave background; cosmology: observations; cosmology: theory; dark matter; distance scale; large-scale structure of Universe

Journal Article.  3536 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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